Mortising-tool



.' U ITED STATES PATENT OFFICE.

CHARLES H. PETTIT, OF JERSEY CITY, NEYV JERSEY.

MORTISlNG-TOOL.

SPECIFICATION forming part of Letters Patent No. 278,177, dated May 22,1883,

Application filed March 17, 1883.

To all whom it may concern:

Be it known that l, CHARLES II. PETTIT, a

citizen of the United States, residing at Jer sey City, in the county ofHudson and State ot'New Jersey, have invented new and usefulImprovements in Mortising-Tools, of which the following is aspecification.

This invention relates to atool which combines a mortising-cbisel and arabbet-chisel, so that the mortise and the requisite rabhet or rabbetsare cut by one and the same operation. The peculiar and novelconstruction of said tool is pointed out in the following specificationand illustrated in the accompanying drawings, in which-- t Figure 1represents a sectional side view. Fig. 2 is a face view. Fig. 3 is alongitudinal section of the mortise and the end rabbets produced by thistool. Fig. 4 is a plan or top view of the same. Fig. 5 is a face view ofthe tool when constructed to produce a mortise with end rabbets and siderabbets. Fig. 6 is a plan or top view of the mortise produced by thistool. Fig. 7 is a longitudinal section of the same.

Similar letters indicate corresponding parts;

In the drawings, the letter A designates the stock, to which are securedthe two chisels B O, B being the mortisingchisel, and O therabbet-chisel. The stock A is constructed to be used in amortising-machine; but my tool can also be used by grasping the stockwith one hand'and striking it with a hammer held in the other hand.- Themortising-chisel B is firmly secured to the stock A by means of screws12 b, and its upper end bears against a shoulder, a, formed on thestock, so that the chisel cannot recede under the blows of the machineor hammer. The rabbet-chisel G is secured to the stock on the side 6opposite to that occupied by the mortising-ehise], and it is held inposition by set-screws c c, which pass through slots d cl, so that thechisel can beadjusted up or down on the stock. The side c of the stockto which the rabbet-chisel is secured is oblique, to correspond to theinner oblique face of the rabbet chisel, (see Fig. 4,) so that when saidchisel is fastened in the required position by the set screws 0 c it (Nomodel.)

is not liable to recede. The cutting-edge of the mortising-chisel Bprojects beyond the cutting-edge of the rabbet-chisel O a sutficientdistance to permit the former to cut a mortise ot' the required depth,while at the same time the rabbet-chisel cuts the rabbet to the depthetrated to a certain depth the chisel 0 begins to act, so that therabbet and the mortise are finished at the same time and by oneoperation. If only end rabbets, F, are desired, the mortising-chisel Bis of the same width as the rabbet-chisel 0; but if side rabbets, F,Figs. 6 and 7, are to he produced in addition to the end rabbets, E, themortising-chisel B is'madc narrower than the rabbet-chisel G, as shownin Fig. 5.

Mortises with end rabbets, as shown in Figs. 3 and 4, and also mortiseswith end and side rabbets, as shown in Figs. 6 and 7, are in common usefor the pulleys of sash-cords, and since the shape of such mortises iswell known to every carpenter, I have used them as an illustration toexplain the utility of my mortising-tool; but it is obvious that my-toolcan be constructed of any desired size and used for square or oblou gmortises of any kind where end rabbets or side rabbets and end rabbetsare desired.

I am aware that a mortising and rabbeting chisel have been used inrelation to a common stock, the former abutting against a shoulder, andthe latter being adjustable by reason of a longitudinal slot. In myinvention I provide against the displacement of the rabbetingchisel fromthe blows by beveling one side to correspond with a similar bevel inreverse direction on the stock. By this means I obviate any possibilityof the rabbeting-tool slipping on its bearings.

What I claim as new, and desire to secure by In testimony whereof I havehereunto set my 10 Letters Patent, ishand and seal in the presence oftwo subscrib- The combination of the stock A, having ing witnesses.

shoulder a and beveled side 0, of the mortisv 5 ing-chisel B and therubbeting-chisel O, hav- CHARLES H. PE'lTlT. [L.

ing' a beveled bearing side and longitudinal slots d, and the fasteningmeans b and d, all Witnesses:

constructed and adapted for joint operation WV. HAUFF,

substantially as described. E. F. KASTENHUBER.

